User Manual Q&AAnswer
Jan 29, 2025 - 02:32 AM
To install the Danfoss MBS 4251 Pressure Transmitter in a potentially explosive area, please follow the instructions provided in the installation guide. Here is a step-by-step guide:
1. Ensure that the transmitter is always supplied from an intrinsic safety barrier. This is important for safety reasons and to comply with national safety regulations.
2. All national safety regulations must be followed during the installation, start-up, and operation of the pressure transmitter. Additionally, comply with the requirements of the Declaration of Conformity and national regulations for installation in explosion areas.
3. Only suitably qualified persons should perform any work related to the pressure transmitter.
4. In the event of damage to the enclosure or diaphragm, the pressure transmitter must be replaced. It is the responsibility of the end user to ensure that the installation is made in accordance with IEC/EN60079-25 and IEC/EN60079-14.
5. To avoid potential electrostatic charging hazards, the transmitter should only be installed in surroundings with low wind speed and where rubbing on the plug is unlikely. Cleaning with a damp cloth is recommended. Ensure that the pressure connection of the pressure transmitter has a reliable connection to earth with an impedance not exceeding 1 Ohm.
6. The pressure connection across boundary walls requiring Category 1G equipment and a less hazardous area must be gas-tight as required by IEC/EN60079-26. Gaskets and seals used at the pressure connection must be suitable for use with the process medium.
7. The medium in contact with the transmitter should be analyzed carefully to ensure it is neutral to stainless steel. Some media can be corrosive, so it is important to consider the compatibility of the process medium with the stainless steel parts. The process connection should be gas-tight, and suitable gaskets/seals should be used.
8. Follow the electrical connection guidelines provided in the installation guide. Cables must be specified for a minimum test voltage of 500 VAC between conductor/earth, conductor/screen, and screen/earth. Consider the total capacity and inductivity of the installation (transmitter + cable).
9. In Zone 0, an intrinsically safe type Ex ia circuit must be used, and national regulations for Zone 0 must be complied with. The pressure transmitter should only be used in Zone 0 at atmospheric pressure between 0.8 and 1.1 bar and at ambient temperatures between -20 and 50 °C.
If you have any further questions or encounter any problems during the installation, please contact Danfoss A/S for assistance. The EC-Type Examination Certificate can be found on their website at www.ia.danfoss.com/ATEXcertificate.
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